The other answers have covered software numbering thoroughly, so I'll skip right to spacecraft.

You get a wide variety of naming patterns for spacecraft, but generally not the 1.2.3.1234 style numbers currently popular with software.

Here's some examples:

SpaceX:

Falcon 1 - the 1st Falcon model, and has 1 engine in its first stage.

Falcon 9 - the 2nd Falcon model, has 9 engines in its first stage.

Falcon 9 Block 5 - the 5th major design revision of the Falcon 9.

Falcon Heavy - a heavy lift variant of the Falcon 9.

ULA:

Thor-Alpha, Thor-Beta, Thor-Gamma, Thor-Delta - rocket designs that used a Thor missile as their first stage

Delta II, Delta III - successors to the Thor-Delta

Delta IV Medium - a Delta IV Small was proposed but never built.

Delta IV Medium+ (4, 2) - can lift a little more than a vanilla Delta IV Medium, with a 4 meter payload fairing and 2 boosters.

Delta IV Medium+ (5, 4) - Delta IV Medium+ with a 5 meter payload fairing and 4 boosters.

Delta IV Heavy - a heavy lift variant of the Delta IV.

Atlas V 401 - an Atlas V with a 4 meter payload fairing, 0 boosters and a 1 engine second stage.

Atlas V 551 - an Atlas V with a 5 meter payload fairing, 5 boosters and a 1 engine second stage.

Blue Origin:

New Shepard - goes to space, like Alan Shepard

New Glenn - goes to orbit, like John Glenn

New Armstrong - goes to the moon, like Neil Armstrong

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