Bridge & other card games/Gerber
Consider this sequence of bidding:
Pass, 1D, pass, 2H
Pass, 2NT, pass, 4C
Partner opened 1 D, I had 18 points, and bid 2H
Q. Is my 4C considered Gerber asking for aces?
That was my intention.
The standard treatment is that a jump to 4C over a natural NT bid is considered to be Gerber.
Since the last bid by partner was 2NT which appears to be natural, your jump to 4C is indeed Gerber. Of course, this assumes that both you and your partner agree to use this standard treatment rather than a different partnership agreement.