Timothy George has proposed that we think not of TULIPs but instead of ROSES instead:
Radical depravity
Overcoming grace
Sovereign election
Eternal life
Singular redemption
Roger Nicole, on the other hand, must not like flowers, for he opts to define Calvinism by using a GOSPEL acronym:
Grace
Obligatory grace
Sovereign grace
Provision-making grace
Effectual grace
Lasting grace