Orkhon alphabet/Labials

Old Turkic

	b	bʲ	p	up	m
Orkhon				—
Irq bitig
Tonyuquq
Yenisei

Potential sources

Aramaic

/p/	/b/	/w/	/m/
		File:Waw.svg	File:Mem.svg
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)

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
File:Brahmi b.svg	File:Brahmi bh.svg	File:Brahmi p.svg	File:Brahmi ph.svg	File:Brahmi v.svg	File:Brahmi m.svg
		possible (b, p)			possible (m, b)

Kharosthi

b	bʰ	p	pʰ	v	m
File:Kharosthi b.svg	File:Kharosthi bh.svg	File:Kharosthi p.svg	File:Kharosthi ph.svg	File:Kharosthi v.svg	File:Kharosthi m.svg
possible (p, b)		possible (p)