This is the 602nd most frequent Finnish word.
ry
"ry" is an abbreviation for "rekisteröity yhdistys," meaning "registered association" in English.
Here, 'ry' stands for 'registered association,' used as part of a company's designation.
Yrityksen nimi on FinSoc ry.
The company's name is FinSoc association.
In this context, 'ry:hyn' uses the partitive form to indicate association membership.
Hän liittyi paikalliseen urheilu ry:hyn viime viikolla.
He joined the local sports association last week.
Here, 'ry:n' is the possessive, indicating something belonging to the association.