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| M | Mark, Mile, Mooring, Mound |
| M | Marsh, Mere, Moat |
| M | Masonry |
| M | Mead, Mews, Mound, Mount |
| (m) | Medium (boulder density) |
| m | Metres |
| M | Metres |
| M | Miles |
| Mag Var | Magnetic Variation |
| Mar | March (month) |
| May | May |
| MB | Municipl Borough |
| MC | Minor Control |
| MCPA | Minor Control Point Album |
| MCTS | Minor Control Traverse Station |
| MD | Mound |
| Me | Mead |
| Meml | Memorial |
| Meri | Merionethshire |
| Mers | Merseyside |
| met | Metalled |
| Met | Metropolitan |
| Met Sta | Meteorological Station |
| Meth | Methodist |
| Mg P | Mooring Post |
| MH | Malt House |
| MH | Man Hole |
| MH & MLW | Mean High and Mean Low Water |
| MH & MLWS | Mean High and Mean Low Water Springs |
| MHW | Mean High Water |
| MHWS | Mean High Water Springs |
| Mid Glam | Mid Glamorgan |
| Midloth | Midlothian |
| Min Tech | Ministry of Technology |
| Misn | Mission |
| Misn Ch | Mission Church |
| Mix | Mixed, Mixture (woods classification) |
| Mkt | Market |
| Mkt Ho | Market House |
| MLW | Mean Low Water |
| MLWS | Mean Low Water Springs |
| MO | Matter of opinion |
| Mod | Module |
| Mon | Monument |
| Monm | Monmouthshire |
| Mont | Montgomeryshire |
| Moray | Morayshire |
| Mortuary | Mort |
| MP | Mile Post |
| MP | Mooring Post |
| MPU | Mail Pick-up |
| Mr | Manor |
| MR | Mooring Ring |
| MS | Mews |
| MS | Mile Stone |
| MSD | Master Survey Drawing |
| MSL | Mean Sea Level |
| MT | Mount |
| Mt | Mountain |
| MT, MTs | Medium Tide(s) |
| Mtl Hospl | Mental Hospital |
| Multi Car Park | Multistory Car Park |
| Munl | Municipal |
| Mus | Museum |
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