Mars square Pluto (orb 1.3°) creates concrete friction between the two planets. The orb is very tight; this describes a stable character pattern more than a passing reaction.
Here, Mars in Aquarius in House 9 brings action, courage, competition, and effort into House 9 (vision, belief, study, and wider horizons), with Aquarius style (independence, networks, distance, and collective change); Pluto in Taurus in House 11 brings crisis, power, survival, and regeneration into House 11 (networks, audience, groups, ideas, ideologies, political beliefs, and collective projects), with Taurus style (nature, good food, physical sensuality, roots, resources, and perseverance).
Concrete friction: this aspect creates friction between Mars (action, courage, competition, and effort) and Pluto's crisis instinct: pressure can become domination, fear, or destructive escalation unless it receives a clear outlet. House 9 (vision, belief, study, and wider horizons) is in friction with House 11 (networks, audience, groups, ideas, ideologies, political beliefs, and collective projects); this can create blockage, inhibition, overreaction, or repeated conflict between the two fields.