There are two types of electric shavers foil and rotary.
Rotary shavers include multiple rotating circular blades on the shaver head.
Philips Norelco is a worldwide shaver brand which specially produces rotary type shavers.
Talking in another way is, the Philips Norelco is the leading rotary shaver brand in the market at present.
The Philips Norelco 9000 is their top-level shaver from all of their production. It won IF design award in 2015.