Suppressed emotional energy, as in Dam, that wants to escape (letting off steam). You are under pressure. Or a jack-of-all-trades.
If the steam is not under pressure, this symbol might also mean dissolving, solving, solution, resolution, and the pleasure of shedding, as in letting go. Steam is also the symbol of devotion and self-abandon. Steam as a combination of hot water (passionate feelings) and air (intellect) also points to conscious commitment.