17e6ec08_Proofreader_s_Marks__Meaning
[Symbol] si [Explanation] Generally, you don't put any word between the two parts of an infinitive verb form (to + verb). 'To boldly go' is a common example of a split infinitive that is so familiar from Star Trek as to become accepted. In an essay, it would be better to say, 'to go boldly' or 'boldly to go' depending on the context. [Meaning] 
split infinitive
Proofreader's Marks
Meaning