Hard to say without a scale reference, but if it’s small, I very small might very will be a proprietary fastener for higher security applications. If it’s a Tesla battery pack, then the epr 5-point torx is a good candidate. If it’s an apple device then searching pentalobe might get you farther.
What on earth is it? Pics? Ruler next to it?
** Church organ music intensifies…
Priest: and all his works?