@dashie A seasoned layout designer friend says "I’d only be guessing, but the reverse field text (white on black) suggests they might be measured values (or maybe Spice calculations?) rather than component information.

“R” might be inductive reluctance, or resonance frequency, rather than resistance (although it could be that), and “T” might be time, temperature, transconductance, or even Tickle-me-Elmo. (Who knows what values or parameters these guys feel is worthy?)

Anyway, that’s my guess.

I will also comment that their ground symbol is awful!"