You can use the &#x27;.&#x27; (dot) key to modify&#x2F;inverse the (single) dot above letters:<p>AltGr . + i =&gt; ı
AltGr . + I =&gt; İ<p>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. &quot; (double quotes) modifies the double dots on the letters, which allows to make öÖäÄüÜëË, etc. The same for ~ (tilde), ` (backtick), &#x27; (single quote).<p>Here the combination for the special Turkish characters:<p>Ç -&gt; AltGr + % + C or AltGr , (comma) + C<p>ç -&gt; AltGr + % + c or AltGr , (comma) + c<p>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<p>Ğ -&gt; AltGr + Shift + 9 + G<p>ğ -&gt; AltGr + Shift + 9 + g<p>I remember these because (Shift + 9 corresponds to &#x27;(&#x27;, i.e. opening bracket, which truned by 90°to left is like the sign that is on top of ğ and Ğ<p>ı -&gt; AltGr + . + i<p>İ -&gt; AltGr + . + I<p>Ö -&gt; AltGr + &quot; + O<p>ö -&gt; AltGr + &quot; + o<p>Same principle for üÜ (and äÄ if you need German as well)<p>Ş -&gt; AltGR + % + S<p>ş -&gt; AltGr + % + s<p>Ü -&gt; AltGr + &quot; + U<p>ü -&gt; AltGr + &quot; + u