Four mudras

Four mudras (Skt. catumudrā; Wyl. phyag rgya bzhi) — in the yoga tantra and inner tantras, there are four types of mudra which 'seal' the enlightened body, speech, mind and activity of the deity. The four mudras are:

1. the great mudra (Skt. mahāmudrā; Wyl. phyag rgya chen po) (see mahamudra)
2. the dharma mudra (Skt. dharmamudrā; Wyl. chos kyi phyag rgya)
3. the samaya mudra (Skt. samayamudrā; Wyl. dam tshig gi phyag rgya)
4. the activity mudra (Skt. karmamudrā; Wyl. las kyi phyag rgya)

Or alternatively:

1. the dharma mudra (Skt. dharmamudrā; Wyl. chos kyi phyag rgya)
2. the great mudra (Skt. mahāmudrā; Wyl. phyag rgya chen po)
3. the primordial wisdom mudra (Skt. jñanamudrā; Wyl. ye shes phyag rgya)
4. the activity mudra (Skt. karmamudrā; Wyl. las kyi phyag rgya)

Source

RigpaWiki:Four mudras