Spell=

Google syntax

[voelspriet]

Noticed that Google adds %spell= to the URL sometimes. If you change the value of spell, you get a different amount of sponsored results. Check

[google.com...]

vs

[google.com...]

Anyone knows some background of this?

[TheDave]

I see the same sponsored listings either way, but that might just be my country

[hyperkik]

My guess is that some advertisers only want to pay for ads under particular spellings of words otherwise regarded as synonyms. (e.g., "colour" but not "color".) Some spellings may suggest that the person viewing the ads is in the wrong country; and some spellings will be more closely associated with a particular product or service than will others.

[linear]

query for wigdet [sic]

G will prompt "Did you mean: widget" which is a clickable link

click on widget and check the URL--there's &spell=1.