You can use the '.' (dot) key to modify/inverse the (single) dot above letters: AltGr . + i => ı AltGr . + I => İ I think this is what you were looking for an

You can use the '.' (dot) key to modify/inverse the (single) dot above letters: AltGr . + i => ı AltGr . + I => İ I think this is what you were looking for and I find this combination easy to remember and other combinations seem to follow mostly the same principle (e.g. " (double quotes) modifies the double dots on the letters, which allows to make öÖäÄüÜëË, etc. The same for ~ (tilde), ` (backtick), ' (single quote). Here the combination for the special Turkish characters: Ç -> AltGr + % + C or AltGr , (comma) + C ç -> AltGr + % + c or AltGr , (comma) + c I remember this combination because the on the % key there is 5, or to say it differently % = Shift + 5, and 5 resembles a bit the symbol that goes below the C in Ç. The same is true for Şş Ğ -> AltGr + Shift + 9 + G ğ -> AltGr + Shift + 9 + g I remember these because (Shift + 9 corresponds to '(', i.e. opening bracket, which truned by 90°to left is like the sign that is on top of ğ and Ğ ı -> AltGr + . + i İ -> AltGr + . + I Ö -> AltGr + " + O ö -> AltGr + " + o Same principle for üÜ (and äÄ if you need German as well) Ş -> AltGR + % + S ş -> AltGr + % + s Ü -> AltGr + " + U ü -> AltGr + " + u