That's a weird Ikea cam-lock thingy with what looks like it might be a Pozidriv head that has been chewed up a little by inappropriate use of a Phillips screwdriver.
Phillips #2 on the left, Pozidriv #2 on the right.
Pozidriv screwdrivers come in three main sizes, usually named PZ3, PZ2 and PZ1 from largest to smallest. There is also a rarely seen PZ0. The most common is PZ2. You should use the largest bit that will engage the screw fully.
Here are some examples of Pozidriv screwdriver bits for interchangeable-bit screwdrivers (hand screwdrivers and power screwdrivers)
It is essential to
Used correctly, Pozidriv bits are much more positive than Phillips and are far less likely to "cam-out" (lift and slip under torque).
Phillips screws often don't stand up to repeated use unless you are exceptionally careful. For use in the home, Pozidriv predominates in the UK and much of Europe. Canadian homeowners seem to prefer Robertson (square recess), others Allen (hexagonal recess). It may be that Ikea's European roots explain why it used Pozidriv for this application (although they seem very fond of Allen bolts).
Definitely a pozi-drive screw. A pozi-drive bit fits tight but a regular phillips will cause the damage in the first pic.
This looks like a Pozidrive screw. The little shallow star shape is easy to spot.
Ikea is Swedish so it's definitely not philips! Pozidriv two normally works unless really chewed up. This screw rotates an eccentric cam so is a bit stiff. Place a wide rubber band under the screwdriver tip and a lot of feed (pressure) holding the drawer firmly. Sometimes gives you a bit more grip.
I work on these most weeks....