The side of a diode that is p-doped, or the p-region. By standard notation, this is generally considered the “positive” side of a diode, except with Zener diodes, which are backwards.
The p region of a diode.
Electronic Devices : Conventional Current Version, 9th Edition by Thomas L. Floyd
The p side of the diode is called the anode
Grob’s Basic Electronics, 11th Edition by Mitchel E. Schultz
An anode is an electrode through which the conventional current enters into a polarized electrical device. This contrasts with a cathode, an electrode through which conventional current leaves an electrical device. A common mnemonic is ACID, for "anode current into device". The direction of conventional current (the flow of positive charges) in a circuit is opposite to the direction of electron flow, so (negatively charged) electrons flow out the anode into the outside circuit. In a galvanic cell, the anode is the electrode at which the oxidation reaction occurs.
An anode is also the wire or plate having excess positive charge. Consequently, anions will tend to move towards the anode.