<kbd>key</kbd>
key MDN Docs

Note, if you are using it from scratch you need also styling for it. Example from MDN:

    kbd {
        background-color: #eeeeee;
        border-radius: 3px;
        border: 1px solid #b4b4b4;
        box-shadow:
        0 1px 1px rgb(0 0 0 / 0.2),
        0 2px 0 0 rgb(255 255 255 / 0.7) inset;
        color: #333333;
        display: inline-block;
        font-size: 0.85em;
        font-weight: 700;
        line-height: 1;
        padding: 2px 4px;
        white-space: nowrap;
    }