41: What's the significance of the alpha mark (ᵀ) prefix on catalog 2 entries?

[Dave Britten]

I've noticed some inconsistency between - and even within - modules as to whether or not the catalog 2 entries have the alpha mark (ᵀ) in front of the name.

The conversion section of the Advantage module doesn't have them, and the matrix section generally doesn't, except for some entries like MEDIT, CMEDIT, MP, MATRX, and MTR. For the math portion of the module, most of the entries have the mark, except for the first three and last one: SOLVE, INTEG, SILOOP, and AIP. The handful of labels in the TVM portion all have the alpha mark.

The Math/Stat module has it on all the entries.

Is it supposed to indicate something about the entry it's attached to?