An image from 2011 showing Stac Pollaidh, often called Stac Polly,
The English translation, Is "The pinnacle of pool river" it has a height 612m (2008ft)
The rocky crest is of Torridon sandstone and is a nunatak, (the ridge was above the ice during the last Ice age) which is why the sides are smooth, and the ridge has many pinnacles.

The following image will show is position in the range.

Posted for the "North West 500 Group"