Jakob Jakobsen, An Etymological Dictionary of the Norn Language in Shetland…
“ In other places in the Isles these sounds appear only sporadically in a few old words. γ: spirant (“soft”) g as in Danish “dage”. χ: open spirant k, as in Danish “magt”, = ch in Scottish “loch”. ŋ: nasal sound of the palatal class (written ng, as in Danish “gang”) . ɯ: labial sound, a middle sound between m and w — m pronounced with the lips not quite closed. A ‘ denotes a breath before a stop (p, t, k) . — ‘l, ‘ᶅ, ‘m, ‘n, ‘ᶇ, ‘ŋ, ‘r denote voiceless l, ᶅ, m, n, ᶇ, ŋ, r. An additional dot denotes that the accent is put on the syllable after which it is placed, e.g. ”
