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alo 'ntyAt pUrva:: upadhA

अलो ऽन्त्यात्पूर्व‌ उपधा ONPANINI 11065

The letter before the last is called nexttolast (/upadhA).

As for instance, the "na- नॱ + upadhA- उपधाॱ " in sUtra nopadhAyAH means "the nexttolast letter of a base ending in n न्".

So the nexttolast of **rAjan- राजन् is a अ.

You may call it the penult if that makes you feel smarter. Or "penultimate", even.