Open loop voltage gain in a datasheet
Open loop gain and DC gain is actually not the same thing. The open loop gain is the gain without any feedback. The open loop gain falls off with increasing frequency. The open loop gain at DC is often called the "DC voltage gain".

Another important characteristic is the gain-bandwidth product (GBW). Which is the product of the DC voltage gain times the open loop bandwidth of the amplifier. To a first approximation the gain decreases with 20dB (or a factor 1/10) per decade, therefore the GBW is roughly equal to the unity gain frequency of the amplifier.

Usually feedback is used to trade off bandwidth with gain.