capacitor pcb symbols

[natezaps]

I'm looking to build a Unison Double Tracker. There is a symbol on the pcb for a capacitor that I don't recognize. It's the oval shape for C7. The value specified is 15p. My best guess would be mica? I know the symbol for film caps is usually a rectangle with the corners truncated. Box caps is a rectangle. Electrolytic is a circle... But what does an oval mean?

 

[Jovi Bon Kenobi]

I used MLCC there. Ceramic works too. Generally, everything under 1n can be MLCC

 

[Chuck D. Bones]

I used MLCC on my Arachnid. That's about the only thing that will fit the 0.1" lead spacing.