Four seals

Four Seals or the four hallmarks of the Buddha's teachings.

They are:

All that is conditioned is impermanent,
All that is defiling is suffering,
Nirvana is peace,
All phenomena are empty and devoid of self.

‘du byed thams cad ni mi rtag pa’o
zag pa dang bcas pa ni sdug bsngal ba’o
mya ngan las ‘das pa ni zhi ba’o
chos thams cad ni stong zhing bdag med pa’o

These four are explained in detail in Mipham Rinpoche's Khenjuk.