In bridge, what opening bid(s) should be made with a high card point in "no man's land"?
A hand "too strong to open 1 NT but not enough to bid 2 of a suit" is of two possible ranges of interest: 18-19 and 20-21. If we are talking a balanced hand with (according to the most common partnership agreements) at worst Kx or Qxx in every suit:


18-19 points opens one of a suit (preferably a minor) and jumps to 2NT as a rebid
20-21 opens 2NT


If the hand is unbalanced then it opens one of a suit and either jump-shifts as a rebid with 20+ points, or reverses as rebid with 18+. 

Don't get in the habit of opening hands 1NT that are unsuitable for notrump play, just because they fall in the 15-17 point range; you sill seriously stunt your development as a bridge player, and alienate potential partners. There is a very good reason why Victor Mollo called the member of his menagerie prone to such bids the Hideous Hog.