- initial number
- initial object
- initial ordinal (= initial ordinal number)
- initial phase
- initial point
- initial position
- initial row
- initial segment
- initial sequent
- initial set
- initial side
- initial situation
- initial solution
- initial state
- initial strip
- initial structure
- initial surface
- initial term
- initial topology
- initial value
- initial value condition
- initial value problem
- initial variety
- initial vertex
- initiating