Some specific camera models, such as Panasonic Lumix or Olympus Tough , use a "P" prefix by default (e.g., PXXXXXXX.jpg).
The "DSC" prefix typically implies this is an unaltered original directly from a camera's memory card. p DSC00177.jpg
If this file is part of a larger collection, the "p" likely helps a user quickly sort images from other files (like "v" for video). Some specific camera models, such as Panasonic Lumix