The following uses may be authorized with such conditions as are deemed appropriate by the Board of Adjustment:
(A) The accommodation of not more than two non-transient roomers as an accessory use to a single- family house, provided that no sign is displayed; and
(B) Directional signs of 12 square feet in connection with any legal business or industry provided they contain no information other than instructions for convenience of vehicular traffic in reaching the business or industry.
(1988 Code, § 11.50-3)