The terms laser engraving, laser etching, and laser marking are commonly used interchangeably. They are similar in the fact that a beam of light is amplified and concentrated at a single focal point. The surface of the metal is heated and its surface is altered. But where they differ is depth of penetration into the metal.
Bitcoin Improvement Proposals or BIPs are design features, inputs, ideas, information, and changes for essentially how Bitcoin works. Topics can vary to virtually anything (including wallets). They are proposed to the Bitcoin community (users, miners, developers, businesses, investors, etc.) in a concise but detailed technical document
Most popular cryptocurrency wallets use the BIP39 standard: the use of mnemonics to serve as your back up recovery seed in the event your wallet becomes compromised. This is also known as a mnemonic seed phrase, recovery seed, wallet back up, etc.
Metal isn't for everyone. Writing your wallet seed on paper can be just as safe, secure, and effective. But keep this in mind: The biggest threat to writing your wallet recovery seed on paper is not necessarily from a fire. The biggest threat may come from: what your seed was written on, what was it written with, and how it was stored.