The meaning of the Acronym RYI is...

RYI is

• Revised Yale Isochrone

More Meanings For RYI:

• Revised Yale Isochrone
• Reference Year Index
• Radical Youth Invasion
• Reclaiming Youth International
• Reference Year Index
• Reclaiming Youth International

RYI is also in:

• Law
• Mathematics
• Media
• Religion
• US Government