Mercury square Uranus (orb 1.9°) creates concrete friction between the two planets. The orb is very tight; this describes a stable character pattern more than a passing reaction.
Here, Mercury in Taurus in House 12 brings intellect, language, thought, and technique into House 12 (retreat, contemplation, long time, and possible confinement), with Taurus style (nature, good food, physical sensuality, roots, resources, and perseverance); Uranus in Aquarius in House 9 brings disruption, independence, and change into House 9 (vision, belief, study, and wider horizons), with Aquarius style (independence, networks, distance, and collective change).
Concrete friction: this aspect creates tension between thought, nervousness, rupture, and contradiction: the mind can cut too fast, provoke, or refuse the frame. Visible angle: Uranus near the Midheaven (orb 5.4°) touches an angle; this aspect is easier to notice through social role, reputation, career, and public image. House 12 (retreat, contemplation, long time, and possible confinement) is in friction with House 9 (vision, belief, study, and wider horizons); this can create blockage, inhibition, overreaction, or repeated conflict between the two fields.