Orkhon alphabet/Labials

Old Turkic

	b	bʲ	p	up	m
Orkhon				—
Irq bitig
Tonyuquq
Yenisei

Potential sources

Aramaic

/p/		/b/	/w/	/m/
פ	ף	ב	ו	מ	ם
possible (p,b)			possible (b,p)	possible (m)

Sogdian

/b/p/			/m/			/w/v/
possible (b)			possible (m)

Hebrew

/p/		/b/~/β/	/w/	/m/
פ	ף	ב	ו	מ	ם
פ	ף	ב	ו	מ	ם
פ	ף	ב	ו	מ	ם
possible? (b)

Latin

/p/	/b/	/f/	/v/	/m/
P	B	F	V	M
possible (b)	possible (up)	possible (up)	possible (p)

or: "b" for b?

Greek

/p/		/b/		/pʰ/		/ps/		/m/
Π	π	Β	β	Φ	φ	Ψ	ψ	Μ	μ
		possible (up)

Brahmi

b	bʰ	p	pʰ	v	m
		possible (b, p)			possible (m, b)

Kharosthi

b	bʰ	p	pʰ	v	m
possible (p, b)		possible (p)