Although originally the character Δ began life as 𐤃 (named dalet, meaning door) so it should be a door, not a house (he says with a wink) and that β should be

Although originally the character Δ began life as 𐤃 (named dalet, meaning door) so it should be a door, not a house (he says with a wink) and that β should be the house (from 𐤁‎, bet, meaning house).