Mixed climbing

Mixed climbing is a combination of ice climbing and rock climbing generally using ice climbing equipment such as crampons and ice tools. Mixed climbing has inspired its own specialized gear such as boots which are similar to climbing shoes but feature built in crampons. Dry-tooling is mixed climbing's most specialized skill and has since evolved into a "sport" unto itself.

Roughly follows the WI rating system with respect to its physical and technical demands. Typically starts at M4. Subgrades of "-" and "+" are commonly used, although the distinctions are typically very subjective. The following table makes a comparison with the Yosemite Decimal System (YDS) and the WI system. Comparing these is rough and only gives an idea of the relative difficulty; the reason different systems exist in the first place is because it's difficult to compare grades between climbing media.

...
Wikipedia