OS meaning in Community ?

Answer:

What is Old Style mean?

Old Style (O.S.) and New Style (N.S.) indicate a dating system from before and after a calendar change, respectively. Usually this is the change from the Julian calendar to the Gregorian calendar as enacted in various European countries between 1582 and the 20th century.

In England, Wales, Ireland and Britain's American colonies, there were two calendar changes, both in 1752. The first adjusted the start of a new year from Lady Day (25 March) to 1 January (which Scotland had done from 1600), while the second discarded the Julian calendar in favour of the Gregorian calendar, deleting 11 days from the calendar for September 1752 to do so. To accommodate the two calendar changes, writers used dual dating to identify a given day by giving its date according to both styles of dating.

For countries such as Russia where no start of year adjustment took place, O.S. and N.S. simply indicate the Julian and Gregorian dating systems. Many Eastern Orthodox countries continue to use the older Julian calendar for religious purposes.

reference

Full Form	Category
Oceanography Society	Academic & Science
Original Solution	Academic & Science
Overseas Studies	Academic & Science
Outstanding Student	Academic & Science
Open Space	Academic & Science
Orzya Sativa	Academic & Science
On Sheet	Accounts and Finance
Ordinary Shares	Business
Off Site	Business
overstock(ed)	Business
Oregon Steel Mills, Incorporated (de-listed)	Business
OmniSky	Business
Overhead Spending	Business
Original Special	Business
Operating Standards	Business
Organizational Software	Business
Osmium	Chemistry
Orientation Sessions	Community
Outside Source	Community
Off Screen	Community
Organ Series	Community
Old Style	Community
Old School	Community
O Sullivan	Community
Optical fiber Singlemode category	Computer and Networking
Open System	Computing
Oracle Support	Computing
Operational Software	Computing
Odd Squad	Computing
Open Software	Computing
OS	Cryptocurrency
Ethereans	Cryptocurrency
Old Suisun	General
Omnipotent Spirituality	General
Operating Style	General
Object Summary	General
Outer Sen	General
Operational Sponge	General
Ole Syversen	General
A Outside System	General
Oculus Sinister	General
Ownage Squad	General
Oh Starcraft	General
On Serotta	General
A On Surveillance	General
Orchard Street	General
Open Socket	General
Officer Standpoint	General
Optical Stabilizer	General
Open Systems	General
Oh Shoot	General
One shot	General
Oculum Sinister	General
Oft S	General
Oleum Sanctum	General
Output Swing	General
Only So	General
Opposite Sign	General
Osteogenic Sarcoma	General
One Size	General
Offentlig Sak	General
Occulus Sinister	General
Old Shinola	General
Ophiological Services	General
Over Sized	General
Oooh Shizzit	General
Old Sebilis	General
Overly Short	General
Online Service	General
Omega Strain	General
On Steroids	General
Ostrich Source	General
Other Source	Governmental
Out of Scope	Governmental
Oil Spill	Governmental
Optional Stopping	Governmental
Other Supplementary	Governmental
Outside Scope	Governmental
Out Station	Indian Railways
Open Source	Information Technology
Operating System	Information Technology
Ouvrier spécialisé	International
Organizzazioni Sindacali	International
Oneself	Internet
OfficerScout	Internet
Out Sized	Jobs
Other Singer	Jobs
Ordinary Seaman	Jobs
mouth (os)	Medical
Obese Strain	Medical
Observational Study	Medical
Occupational Safety	Medical
Office Surgery	Medical
oligosaccharide	Medical
Omenn syndrome	Medical
Opening Snap	Medical
Opitz syndrome	Medical
Oral Solution	Medical
Organ-Specific	Medical
Osgood-Schlatter	Medical
osteosarcoma	Medical
Osteosclerosis	Medical
Outer Segment	Medical
Overlap Syndrome	Medical
Oxidative Stress	Medical
Ocular Sinister	Medical
Orthopterists' Society	Medical
Overall Survival	Medical
Osteogenic Sarcoma (bone tumors)	Medical
Left eye (oculus sinister)	Medical
OStium (mouth)	Medical
Oral Surgery	Medical
Oxygen Saturation	Medical
Orthopaedic Surgeon	Medical
Opposite Strand	Medical
left eye?culus sinister	Medical
On Service	Military and Defence
Operations Specialist	Military and Defence
Opportunity To Serve	Military and Defence
Old Skool	Military and Defence
On Station	Military and Defence
Ordnance Survey	Military and Defence
Overtly Similar	Military and Defence
Other Specifications	Military and Defence
Outer Sensor	Military and Defence
Operating Strength	Military and Defence
On Sea	Military and Defence
Online Services	Networking
Overhead Sending	Networking
Open Server	Networking
Off-street Parking	Real Estate
Optimize for Size	Softwares
Open Sockets	Softwares
Outer Space	Space Science
On-orbit Station	Space Science
Operating Software	Space Science
Optics Subsystem	Space Science
Orbital Servicing	Space Science
Orbiter Specification	Space Science
Outside Shot	Sports
Optimal Strategy	Sports
Open Street	Stock Exchange
Operations System	Telecommunication