SNPs which are found in more than one haplogroup used to be given names ending in a or b.More recent papers show these SNPs ending in .1 or .2. Earlier versions of the ISOGG tree show both names, but the current treeshows only the more recent notation.
Current: 12f2.1 Former: 12f2a
Current: 12f2.2 Former: 12f2b
SNPs that appear in a single haplogroup with multiple y-positions are now shown with extensions of _1, _2.
P7_1, P7_2, P7_3.