This property defines approval of Symbols as Unicode in version 5.1 in 2008
Characters like Ͱ,ͱ,Ͳ, etc. are listed under 5.1 Age.
1624 Characters are present in 5.1 Age starting with the Unicode point U+0370 that represents the character Ͱ.
Currently, as per latest version 15.0.0, Unicode supports 26 number of Age. Here are a few examples - 1.1,10.0,11.0, etc.