A beacon is a light that guides you along a dark path. A beacon is often a spiritual or religious symbol, so a beacon in a dream can symbolize a religious or spiritual journey.
However, a beacon in a dream can be a guide toward any type of goal. This can include the achievement of material success, for example, in the form of a better job, or the attainment of emotional happiness, for example, in a better relationship with a family member. The beacon can be guiding you toward physical or intellectual self-improvement.
Since a beacon is usually used to light up a dark path, you may see a beacon in a dream when you are beginning to give up hope that you will ever become enlightened spiritually or you will ever reach your goal. The beacon is a message that you have the power to achieve the goal that you have hoped to achieve.
A beacon in a dream can also be a warning about something.