Number of terms (SV12)
Any number up to 6.

Terms (SV13-18)
The names of the school terms (up to six of them) – used in calendar functions. The first must be the start of the academic year.

Current term started (SV56)
The first day of the current term. Used in various places as a default. Normally either 1st September, 1st January or 1st April.