The voiced labial-velar nasal is a sound used in some spoken languages. The IPA letter for this sound is ⟨ŋm⟩. It is not in English.
Characteristics
The phonation is voiced. This means that the vocal cords vibrate while the sound is being pronounced.
The place of articulation (where the sound is produced) is labial–velar. This means that this sound is produced with the lips and with the back part of the tongue (the dorsum) against the soft palate (the velum) at the same time. The dorsal closure is released before the labial closure, but they overlap for most of the time.
It is a nasal consonant. This means that air is allowed to escape through the nose, either exclusively (nasal stops) or in addition to through the mouth.