Lines with Circular Terminators and Symbols with Overlines
You are correct.  \$\overline {\mathrm{OE}}\$, *OE, nOE, !OE, and probably others mean &quot;not OE&quot;, or &quot;OE, active-low&quot;.
The bubble on a logic input means that the sense of the input is inverted -- so in the data sheet you're looking at, \$\overline {\mathrm{OE}}\$ is entirely consistent with the bubble.
Note that it's pretty common practice to have control signals be active low.  This originally came about because TTL logic could pull a line down with a lot more authority than it could pull it up, and because it was not uncommon to have more than one controlling device pull a line low, with resistors used to pull the line high (Google on &quot;wired-or&quot; and &quot;open-collector&quot;).  It's carried forward mostly by tradition, although you still see parts that have more current sinking ability than current sourcing ability.