Spade, and Bullet.
male and female.
In common electrical use the size is denoted by the colour of the plastic insulator.
red (small usually on electronics) blue (the most common size for domestic mains 240 volt), and yellow (large)
Not the standard Red Blue Yellow crimps you get from electrical supply shops. As the novocaine said these are the higher quality types used in automotive manufacturing. Much more complicated, more spring, more reliable contact. If you only want a couple, you might try and make friends with a local (main dealer) car service department who should have spares of stuff fitted in the factory. Otherwise Rapid Electronics or search RS Components and Farnell.
These fall in the broad category of uninsulated crimp connectors - you do insulate them but the plastic shell or cover is a separate part holding one or several of these connectors. Note that you won't be able to crimp them to the wire properly using a standard tool made for the Red/Blue/Yellow type.
They are sometimes used on factory original car radio connectors. That's one place where I've seen them used before.
And this kind of thing does come in different sizes for different current ratings. It would be sensible to measure the width and try to check.
The connectors are out of a Kress SDS drill's removable power cable.
A few years ago, while in the process of hacking off render, my drill stopped working suddenly with no warning. Being in the middle of a job I had no time to diagnose the fault, and immediately went out and bought a replacement. Yesterday I happened to come across the old drill in the attic and thought I'd take a look.
Remembering a recent comment by Mr. Sunnybob, the first thing I tried was manipulating the power cable close to the drill's strain relief while holding the trigger, and hey presto, the drill worked. The cable was broken internally.
Being a Kress drill, it has a removable power cable similar to Festool's system, which means it's not as straight forward to repair as a regular tool.